PROFIBUS-DP – Fiber-Optic Coupler OC11EX/3G.2

The optocoupler OC11Ex/3G.2 converts the
PROFIBUS-DP signals into optical signals.
The bus signals can therefore be transmitted
from the safe area to the Ex area over long
distances without potential or interference.
When using fiber-optic cables, the maximum
baud range is 2500 m for OM1 (62.5/125-µm)
cables and 1500 m for OM2 (50/125-µm) cables.
The optocoupler can be installed in the nonEx area or in zone 2. The OC11Ex/3G.2 receives the PROFIBUS-DP signals at its standard interface RS485 and transmits them via
the intrinsically safe optical interface to the optocoupler OC11Ex/2G.2 in zone 1.
The optocoupler OC11Ex/3G.2 is equipped
with
■ RS485 interface – standard PROFIBUSDP interface with RS485 level acc. to EIA
485 (the control cable for direction control
is not connected)
■ intrinsically safe optical interface with ST
connectors for emitter and receiver
Up to 31 bus nodes can be connected to the
fiber-optic coupler. Baud rates of 9.6 kbps up
to 1.5 Mbps are possible or will be automatically detected.
For diagnostic purposes there are four status
LEDs that indicate power ON, fiber-optic segment, RS485 interface and baud rate. The device features an M8 communication interface.
Two OC11Ex devices can be coupled together via the M8 interface. Wire-break and shortcircuit are not transmitted from one segment
to the next one. All segments can thus be operated trouble-free and independently of one
another.
In order not to limit the number of nodes and
cable length of a PROFIBUS-DP segment,
amplitude and phase are reproduced in the
coupler. The user can choose between capacitive and direct earthing.
■ Device for data transmission between electrical and optical fieldbus circuits
■ Power supply of max. 31 nodes
■ OM1 (62.5/125) for transmitting data over
distances up to 2500 m
■ OM2 (50/125) for transmitting data over
distances up to 1500 m
■ Mounting in zone 2 allowed
■ Note: Idle level corresponds to active light!